#include<iostream>
#include<cstdio>
#include<stdio.h>
int main()
{
  //C
  printf("hello printf->stdout\n");
  fprintf(stdout,"hello printf->stdout\n");
  fprintf(stderr,"hello printf->stderr\n");

  //C++
  std::cout<<"hello cout->cout"<<std::endl;
  std::cerr<<"hello cerr->cerr"<<std::endl;



}
